What is MAC configuration?When RRC will configure MAC ,Is it for every UE ?

Question

How MAC will schedule PCCH message with ETWS or Sys info change(for the UEs which are in IDLE)?As RRC donot provide any configurations to MAC (we will provide PCCH config like UE indx val ,nb and Drx for DL data indication but in ETWS we wil not have UE indx val).Is there any other mechanism for MAC to Schedule PCCH message with ETWS notification?

Answer 1

An eNodeB configures UE with the MAC main config while processing RRC connection setup procedure. It is done to configure MAC layer with the basic configuration for signalling radio bearer and data bearer. For each UE, MAC layer is configured with the since each UE needs dedicated resources or treatment from MAC layer.

I want to highlight few parameters such as:
drx-inactivity timer
drx-retransmission timer
drxShortCycletimer
extendedBSR information
extendedPHR
maxHARQ-Tx

are configured for an UE at the MAC layer. I am not expect in the MAC layer but having overall system knowledge.
Based on that I answered this question. Hope it will help a bit.

Answer 2

HI , let me explain in high level .... In LTE RRC is responsible to configure all UEs for their layer configurations.

For suppose 4 UES are try to attach with enodeb, for this 4 UES some common configurations and some dedicated configurations are needed. common configuarations for all the uses will be provided by broadcast SIB2 information.

Now for each UE its dedicated information will be configured while RRC connection setup or Reconfiguration.

Now as per your query, MAC configuration is also part of RRC connection setup. In this message with dedicated info MAcMainConfig info gives the MAC level configurations.

Broadcast information is same for all UEs, but dedicated info may or may not same for all Ues.

Regards,
Suchi